CN110596454A - Intelligent power direction detection device and method applied to micro-grid system - Google Patents
Intelligent power direction detection device and method applied to micro-grid system Download PDFInfo
- Publication number
- CN110596454A CN110596454A CN201910792488.9A CN201910792488A CN110596454A CN 110596454 A CN110596454 A CN 110596454A CN 201910792488 A CN201910792488 A CN 201910792488A CN 110596454 A CN110596454 A CN 110596454A
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- power
- grid
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- module
- mutual inductor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
The invention introduces an intelligent power direction detection device and method applied to a micro-grid system. The device comprises a mutual inductor module and an intelligent measurement and control module. The detection method comprises the following steps: when the system is powered on and operated, firstly, the control module stops grid-connected power generation of all the micro-grid systems in a wired/wireless communication mode, specific time is delayed to be used as a sampling detection period, the acquisition module acquires voltage and current signals of the power distribution bus inlet wire end at present, the current voltage, current and power are calculated through the calculation module, and the power forward direction of the mutual inductor module at the power distribution bus inlet wire end is judged and automatically calibrated by referring to the power forward direction of all the micro-grid systems after power generation is stopped, namely the power flows from the power grid side to the load side.
Description
Technical Field
The invention relates to an intelligent power direction detection device and method applied to a micro-grid system.
Background
The micro-grid is a small-sized power generation and distribution system organically integrating a distributed power supply, a load, an energy storage device and a monitoring and protecting device. By means of key technologies such as operation control and energy management of the micro-grid, grid-connected or isolated island operation of the micro-grid can be achieved, adverse effects of intermittent distributed power supplies on a power distribution network are reduced, the output of the distributed power supplies is utilized to the maximum extent, and power supply reliability and power quality are improved. The access of distributed power sources to a power distribution network in the form of a microgrid is generally regarded as one of the effective ways to utilize distributed power sources.
The micro power sources in the micro grid can be roughly classified into inverter type micro power sources and rotating electrical machine type micro power sources, wherein the micro power sources can include easily controlled power sources such as diesel generators, micro gas turbines and the like, and can also include intermittent and uncontrollable power sources such as wind generators, photovoltaic cells and the like, and various types of energy storage devices are generally required to be configured. The switching and interaction of these power sources adds complexity to the microgrid research. How to correctly install and use various devices in the microgrid is a hot issue of current research.
Due to the complexity of field conditions and the non-normative operation of installation workers, the polarity of the mutual inductor is often easily connected in a wrong way, so that the phase angle of voltage and current is 180 degrees different from the correct phase angle, the power and power direction obtained by sampling calculation is opposite to the correct power and power direction, the micro-grid system with the functions of preventing power backflow, matching load power and grid-connected power generation is greatly influenced, wrong protection actions are carried out on the micro-grid system or interference is generated on metering, and therefore, a device for realizing automatic detection and calibration of the power direction is developed under the condition of not depending on manual detection, and the device has great market value and economic benefit.
Disclosure of Invention
The invention aims to solve the technical problem of researching an intelligent power direction detection device and method applied to a micro-grid system. The problem of need manual adjustment or power measurement deviation because mutual-inductor installation direction causes inadequately is solved.
To solve the above technical problem, the present invention is implemented as follows: the device calculates and automatically calibrates the current power direction of the system by collecting voltage and current signals, and the detection method comprises the following steps: when the system is powered on and operated, firstly, the control module stops grid-connected power generation of all the microgrid systems in a wired/wireless communication mode, specific time is delayed to be used as a sampling detection period, then the sampling module collects voltage and current signal vectors of the power distribution bus inlet wire end, the current voltage, current and power are calculated through the calculation module, and the power forward direction of the transformer module at the power distribution bus inlet wire end is judged and automatically calibrated by referring to the power forward direction of all the microgrid systems after power generation is stopped, namely the power flows from the power grid side to the load side.
Step 1: the mutual inductor module is arranged between the distribution bus and the public connection point of the microgrid and forms signal connection with the intelligent measurement and control module.
Step 2: when the system is powered on and operated, the control module stops grid-connected power generation of all the micro-grid systems in a wired/wireless communication mode.
And step 3: after delaying a specific time, the sampling module starts to acquire voltage and current signal vectors of the inlet wire end of the power distribution bus.
And 4, step 4: the calculation module calculates the current voltage, current and power.
And 5: and the control module refers to the power forward direction of all the microgrid systems after the power generation is stopped, namely the power flows from the power grid side to the load side, so as to judge and automatically calibrate the power forward direction of the mutual inductor module at the power grid incoming line end.
The invention relates to an intelligent power direction detection device and method applied to a micro-grid system, which are suitable for a single-phase/three-phase power grid, do not depend on the installation direction of a mutual inductor, and can ensure the normal operation of the micro-grid system.
Drawings
Fig. 1 is a block diagram of a power direction detection system.
Fig. 2 is a power direction detection operation diagram.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
As shown in figure 1, the intelligent monitoring system mainly comprises a mutual inductor module and an intelligent monitoring module. The mutual inductor module is arranged between the distribution bus and the public connection point of the microgrid and forms signal connection with the intelligent measurement and control module; the intelligent measurement and control module comprises a sampling module, a control module and a calculation module, wherein the sampling module is mainly used for collecting voltage and current signal vectors of a power distribution bus incoming line end; the control module is mainly used for controlling the micro-grid system and judging and automatically calibrating the power direction of the mutual inductor module at the power distribution bus incoming line end; the calculation module is mainly used for calculating voltage, current and power.
As shown in fig. 2, the detection method is as follows: when the system is powered on and operated, the control module stops grid-connected power generation of all the micro-grid systems in a wired/wireless communication mode, specific time is delayed to be used as a sampling detection period, then the acquisition module acquires voltage and current signals of the power distribution bus line inlet end at present, the current voltage, current and power are calculated through the calculation module, and the power forward direction of the mutual inductor module at the power distribution bus line inlet end is judged and automatically calibrated by referring to the power forward direction of all the micro-grid systems after power generation is stopped, namely the power flows from the power grid side to the load side.
The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. The utility model provides an intelligent power direction detection device for little grid system which characterized in that: the device comprises an intelligent measurement and control module and a mutual inductor module; the intelligent measurement and control module comprises a sampling module, a calculation module and a control module; the sampling module is mainly used for collecting voltage and current signal vectors of a power distribution bus incoming line end; the calculation module is mainly used for calculating voltage, current and power; the control module is mainly used for controlling the micro-grid system and automatically calibrating the current power direction; the mutual inductor module comprises a voltage mutual inductor and a current mutual inductor, the mutual inductor can be a traditional core-penetrating mutual inductor or a buckle mutual inductor, is installed between a distribution bus and a microgrid public connection point, and is in signal connection with a control module in the intelligent measurement and control module to serve as input of voltage and current detection signals.
2. A detection method using the detection apparatus according to claim 1, characterized in that: after the existing micro-grid system is controlled and delayed for a specific time, the current power direction of the system is calculated and automatically calibrated by collecting voltage and current signals of a power distribution bus incoming line end; and stopping grid-connected power generation of all the micro-grid systems or ensuring that the power flow direction flows from the grid side to the load side before the power direction of the mutual inductor module is automatically calibrated.
3. The detection method according to claim 2, characterized in that: the delay time is 20 milliseconds to 99999 seconds.
4. The detection method according to claim 2, characterized in that: the communication mode of the intelligent measurement and control module and the micro-grid system is a wired/wireless mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910792488.9A CN110596454A (en) | 2019-08-26 | 2019-08-26 | Intelligent power direction detection device and method applied to micro-grid system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910792488.9A CN110596454A (en) | 2019-08-26 | 2019-08-26 | Intelligent power direction detection device and method applied to micro-grid system |
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| Publication Number | Publication Date |
|---|---|
| CN110596454A true CN110596454A (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910792488.9A Withdrawn CN110596454A (en) | 2019-08-26 | 2019-08-26 | Intelligent power direction detection device and method applied to micro-grid system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112345998A (en) * | 2020-09-15 | 2021-02-09 | 中国电力科学研究院有限公司 | Electric energy metering system and method under complex operation state of power grid |
| CN113466543A (en) * | 2021-04-15 | 2021-10-01 | 江苏阿诗特能源科技有限公司 | Power detection device and detection method of power generation system |
| CN114726404A (en) * | 2022-02-24 | 2022-07-08 | 江苏芯云电子科技有限公司 | Automatic detection system and method for broadband power line carrier communication module |
-
2019
- 2019-08-26 CN CN201910792488.9A patent/CN110596454A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112345998A (en) * | 2020-09-15 | 2021-02-09 | 中国电力科学研究院有限公司 | Electric energy metering system and method under complex operation state of power grid |
| CN112345998B (en) * | 2020-09-15 | 2022-10-18 | 中国电力科学研究院有限公司 | Electric energy metering system and method under complex operation state of power grid |
| CN113466543A (en) * | 2021-04-15 | 2021-10-01 | 江苏阿诗特能源科技有限公司 | Power detection device and detection method of power generation system |
| CN113466543B (en) * | 2021-04-15 | 2023-08-08 | 江苏阿诗特能源科技股份有限公司 | Power detection device and detection method of power generation system |
| CN114726404A (en) * | 2022-02-24 | 2022-07-08 | 江苏芯云电子科技有限公司 | Automatic detection system and method for broadband power line carrier communication module |
| CN114726404B (en) * | 2022-02-24 | 2024-01-19 | 江苏芯云电子科技有限公司 | Automatic detection system and method for broadband power line carrier communication module |
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Application publication date: 20191220 |